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.Management Sciences
Category: Environmental Engineering
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?
A. waste pipe
B. soil pipe
C. vent pipe
D. antisiphonage pipe
The working conditions in imhoff tanks are_______________?
A. aerobic only
B. anaerobic only
C. aerobic in lower compartment and anaerobic in upper compartment
D. anaerobic in lower compartment and aerobic in upper compartment
The design discharge for the combined sewer system shall be taken as________________?
A. equal to rainfall
B. rainfall + DWF
C. rainfall + 2 DWF
D. rainfall + 6 DWF
Which of the following retards the self purification of stream ?
A. higher temperature
B. sunlight
C. satisfying oxygen demand
D. none of the above
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true
The minimum and maximum diameters of sewers shall preferably be_________________?
A. 15 cm and 100 cm
B. 15 cm and 300 cm
C. 30 cm and 450 cm
D. 60 cm and 300cm
Standard EDTA (ethylene diamine tetra acetic aciD. solution is used to determine the_______________?
A. hardness in water
B. turbidity in water
C. dissolved oxygen in water
D. residual chlorine in water
The major disadvantage of lime soda process of water softening is that_________________?
A. it is unsuitable for turbid and acidic water
B. huge amount of precipitate is formed which creates a disposal problem
C. the effluent cannot be reduced to zero hardness
D. it is unsuitable for softening the water of excessive hardness
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?
A. total alkalinity
B. total hardness
C. total hardness – total alkalinity
D. non carbonate hardness
The percentage of chlorine in fresh bleaching powder is about________________?
A. 10 to 15
B. 20 to 25
C. 30 to 35
D. 40 to 50
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